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I want to flatten the base of my STL file & cut it into a regular shape (e.g., round, square...). The results I expected should be the same as this video shows (https://www.youtube.com/watch?v=bSNy9iUqDbI). I tried but I did not succeed with his method in blender. If anyone can help me, I would be appreciated. It is best to give a detailed method because I am a beginner in this. Thank you in advance.
My STL file is here: https://www.dropbox.com/s/by7fdw49x05savj/terrain_test01.stl?dl=0.

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    $\begingroup$ Please use the edit link at the bottom of your question (i.stack.imgur.com/lXFuK.png) and add images that might help us understand your scene and settings. ( to learn how to post images read this link:) $\endgroup$ – user1853 May 16 '19 at 5:36
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  1. Import model from stl format Import model from stl

  2. In edit mode, select all vertices and delete duplicates (Merge distance in 2.80) with desired accuracy delete duplicates

  3. Select all faces in edit mode and Extrude it down extrude

  4. Resize selected faces by Z axis to 0, align it by lowest vertice of top surface resize

  5. Select all faces, again remove duplicate vertices and Recalculate Normals (if everything fine you do not need to make it Inside) recalculate

  6. Add Cylinder object and make it right cylinder

  7. In edit mode remove cylinder top face, select all leftover faces and Extrude region to cover the main object cover the main object

  8. Add Boolean modifier to Terrain and set up Difference with Cylinder result

  9. Profit!

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